Announcement

Collapse
No announcement yet.

What Can I Expect With New Jets In Carb

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • What Can I Expect With New Jets In Carb

    Hi All,

    I finally tore my carb apart to clean it. I discovered my 2004 RoadStar 1700 had a 37.5 Pilot in it, and I couldn't find any numbers on the Main. I cleaned the carb and put it back on, but the bike still wasn't running as well as it did earlier this summer. Knowing that I needed to pull the carb off again and clean it more, I went ahead and ordered the suggested 40 pilot and the Baron's Jet Kit for the needle and Main. I also ordered a new diaphragm (the old one seemed swollen/ballooned). I'm curious if I should expect any noticeable power-increase, smoother running engine.

    I adjusted valves this past summer and changed the plugs while I was at it. The old plugs looked fine with no noticeable sign of it running lean. It always seemed to spit/burp out the intake when it was cold, but that would clear as it warmed up. Is this something that might clear up with the new jets?

    The bike is a 2004 1700, pumpless, RoadHouse Dual Exhaust with MaxAir intake.

  • #2
    Did you also do the grizzly needle valve since you went pumpless... What clip position are you using.... Remove the screen fternon carb inlet? Is petcock all clean and free flowing? You keep any inline filter between tank and pump? Vent gas tank cap and/or remove roll over valve?
    LET'S RIDE

    Comment


    • #3
      The conversion was done before I bought it, but I believe all of that is correct. It has a Pingel petcock, a Barons gas cap that I can loosen to vent more. There is not filter between the petcock to the carb (that's why I had to pull it and clean it after I got some trash in it). I don't know about the needle. How would I identify if it's a grizzly? I didn't check the clip position when I cleaned it last as I didn't plan to adjust any of the top of the carb. Sounds like I should set it to the 4th groove from the flat, correct?

      I rode it for three years without much of an issue, which is why I believe the pumpless conversion was done properly. I screwed up and ran out of gas on a recent ride and pulled some trash in the carb when I filled the tank. That's when I noticed the jets were different than what folks were saying they should be. It sounded like the 40mm pilot and 172.5 Main was almost standard, but my carb seems like it's jetted for a 1600 instead of a 1700, so I thought I would switch them out. It always seemed to run strong (way more power than my 1998 Honda Shadow Spirit 1100), but I don't know what to expect with the suggested jetting. I'm also going to reseal the manifold and make sure there are no leaks there.

      I don't normally play with the carb much, so any advice is greatly appreciated.

      Comment


      • brianmac
        brianmac commented
        Editing a comment
        1600s do run strong!

    • #4
      A 1700 with 1600 jets would be lean for sure. If you're bumping up the pilot, and you don't have any air leaks, you will likely get less balking or stumble when cracking the throttle open. Should pull a hill better, and should wring 3rd gear out to the rev limiter pretty damn quick (should be in the vicinity of 87 to 90 mph if you have a stock ignition module) Also, it's an 04, so that's the party zone for sticky valve syndrome. Make sure your oil and filter changes, you put in 4 quarts and no more. If I had an 04, I would treat it like my 03, and run 4 ounces of Marvel Mystery Oil in at least every other tank of gas to keep the top end good and clean.


      Wherever you go in life, ride there if at all possible.

      Comment


      • #5
        Thanks for the suggestions about the Marvel Mystery Oil. I haven't tried that yet. I pulled the carb apart again today. I can't read the Main Jet too well, but it looks like the current setup is a 37.5 pilot, 180 main and the needle is on the 3rd groove and shimmed with a washer. Here is a pic of the needle in the current configuration. Is this the grizzly needle that you all mentioned previously? I didn't take pics of the jets as I'm planning to follow the 40 pilot, 172.5 main suggestion.
        Click image for larger version

Name:	CarbNeedle.jpg
Views:	91
Size:	216.4 KB
ID:	115891

        Comment


        • Brad_G
          Brad_G commented
          Editing a comment
          The Grizzly needle is for the fuel inlet/float. It's to allow better fuel flow into the carb when the electric pump has been removed.

      • #6
        So, I finished this re-jetting project and thought I would post my initial thoughts in case anyone else had a similar setup that I started with.

        Bike Specs:
        2004 Road Star 1700 Pumpless
        Roadhouse Dual exhaust
        MaxAir Intake
        Pingel Petcock
        No fuel filter
        Barons gas cap (can loosen to vent)

        The bike was already modified before I bought it, so I didn't know what was in the carb until recently. I just knew it felt like it ran strong and I didn't feel like I needed to mess with it much. The bike always seemed to burp out of the intake, especially when it was cold. The bars would rattle and shake a ton at idle (folks kept asking me if the bike was cammed). It was great in the low end, riding around town, however, the top end felt like it was lacking when I got on the highway. It didn't have any problem getting up to highway speeds, but it just always felt like it should have more range in the top end.

        I don't know who the manufacturer was for my initial jets, but the carb had a 37.5 pilot, a 185 main, and a needle that was after-market, but not a Baron's.

        I followed the suggestions on here and installed the Barons 40 pilot, 172.5 main and needle (clipped on the 4th groove with a washer, and PMS turned out 2.5 turns. I found a break in the rain yesterday and took it out for a test ride.

        It felt like it breathed better, and there was a noticeable change in it's behavior. At idle, the bike didn't shake nearly as badly, the bike didn't burp at idle like it used to, and the throttle response felt smoother through the range. It was great! That was the best that bike has felt in a long time. I'm THRILLED!

        I ordered the Grizzly 660 Needle Assembly (which is backordered) and will install that at a later date, but I am thrilled with the throttle response after changing out the jets and needle.

        Thanks y'all!

        Comment


        • #7
          I'm glad you are happy with the results. Make sure that after the bike is up to operating temps that the idle is set to around 950 rpm. If you have it set to a low loping idle it could cause the little shake, give an off idle stumble and also lower oil pressure at idle. Might even try a nice heavy dose of seafoam gas treatment in you first tank of gas when you are able to get out for a good ride. It will clean up any heavy carbon deposits on the pistons and valves.

          Comment


          • Blackbeard
            Blackbeard commented
            Editing a comment
            Awesome, will do. I have my idle up. I'll give that a try when I have a longer ride planned. Thanks again.

        • #8
          If that needle has 6 grooves in it, it is likely a Speedstar needle. It looks pretty stout in the pic.

          Comment


          • Blackbeard
            Blackbeard commented
            Editing a comment
            I don't think it has 6 grooves, but I'll take another look at it. The taper was definitely different then the Barons.

        • #9
          I appreciate the thread. I road last summer with an off idle stumble knowing it was likely due to the need for a larger pilot jet. I knew this because of the knowledge shared on this site. I installed a 40 pilot this afternoon...and no more off idle stumble! The info on RSC was also the deciding factor why I bought my roadstar so many years ago. You guys are the best!

          Comment

          Latest Posts

          Collapse

          Topics Statistics Last Post
          Started by roadiemort, 5 hours ago
          3 responses
          51 views
          1 like
          Last Post Father Pobasturd  
          Started by LDofDC, 12-23-2020, 12:17 PM
          127 responses
          693 views
          0 likes
          Last Post roadiemort  
          Started by whale2455, 18 hours ago
          3 responses
          82 views
          0 likes
          Last Post Tykes_Place  
          Started by Jaybo, 6 days ago
          34 responses
          287 views
          2 likes
          Last Post Shores
          by Shores
           
          Started by JayPee, 17 hours ago
          5 responses
          53 views
          0 likes
          Last Post roadiemort  
          Started by Jinro, 1 day ago
          7 responses
          116 views
          2 likes
          Last Post Jinro
          by Jinro
           
          Started by $arleysSuck, 21 hours ago
          9 responses
          69 views
          0 likes
          Last Post Horsehammerr  
          Started by AZRoadie, 2 days ago
          15 responses
          111 views
          0 likes
          Last Post Shores
          by Shores
           
          Started by Madmichaeld, 20 hours ago
          7 responses
          45 views
          0 likes
          Last Post Father Pobasturd  
          Started by Doc_V, 09-23-2020, 02:48 AM
          92 responses
          1,595 views
          1 like
          Last Post davej
          by davej
           
          Started by NthernLgts, 4 days ago
          11 responses
          183 views
          0 likes
          Last Post NthernLgts  
          Started by roadiemort, 6 days ago
          8 responses
          115 views
          0 likes
          Last Post roadiemort  
          Started by Madmichaeld, 20 hours ago
          1 response
          41 views
          0 likes
          Last Post Father Pobasturd  
          Started by Peterboro Pete, 2 days ago
          11 responses
          66 views
          0 likes
          Last Post Chromepony  
          Started by AZRoadie, 2 days ago
          4 responses
          107 views
          0 likes
          Last Post Chromepony  
          Started by AZRoadie, 1 week ago
          12 responses
          258 views
          0 likes
          Last Post AZRoadie  
          Started by Shores, 1 day ago
          2 responses
          37 views
          0 likes
          Last Post moose
          by moose
           
          Started by Jinro, 12-08-2020, 06:02 AM
          19 responses
          511 views
          10 likes
          Last Post Ironman
          by Ironman
           
          Started by MikeyC, 1 week ago
          13 responses
          112 views
          0 likes
          Last Post MikeyC
          by MikeyC
           
          Started by BrokenWheel, 1 day ago
          8 responses
          61 views
          0 likes
          Last Post BrokenWheel  
          Working...
          X